There might be more than 100 million undiscovered black holes in our universe.By Jessica MileyMarch 02, 2019Researchers have found a previously unknown black hole by examing its effects on an interstellar gas cloud. The discovery introduces a new method for identifying other hidden black holes.SEE ALSO: MIT SCIENTISTS DETERMINED THE SPIN OF A BLACK HOLE USING ANNIHILATED STARThere is thought to be more than 100 million quiet black holes lurking in our Galaxy.
When looking to buy electronic items - everything from headphones and earphones to electronic test equipment and multimeters, or electronic components there are so many products on the market. Knowing the best buys are not always easy as it is not always possible to know all the things to look for.Check our Product StoresBuying guidesRead our informed buying guides to all sorts of electronic equipment and gadgets so that you can make informed decisions about what you buy and make sure you buy the best options.
Amateur radio or ham radio is a fascinating hobby that has captivated the interest of countless thousands and provides a stimulating technical hobby for people around the globe.Many radio amateurs or hams enjoy talking to friends around the globe. Others enjoy contacting people in far and distant lands, while others enjoy constructing their own equipment, investigation propagation techniques, experimenting with new technology, and all based around radio.
Multimeter Tutorial Includes:Test meter basicsAnalogue multimeterHow does an analogue multimeter workDMM digital multimeterHow a DMM worksDMM accuracy & resolutionHow to buy best digital multimeterHow to use a multimeterVoltage measurementCurrent measurementsResistance measurementsDiode & transistor testFault finding transistor circuitsDigital multimeters are one of the most widely used electronic test instruments.
Cloud Computing Fundamentals Includes:What is the CloudInfrastructure as a Service, IaaSPlatform as a Service, PaaSChoose best cloud service providerWith all the changes rapidly taking place within the information technology, IT arena, it is difficult to keep up with all the technology.One area of IT that has taken off in recent years is that of Cloud technology - there is a huge amount of talk about cloud computing, storing data on the cloud, and using cloud services.
RF & microwave power meter Includes:RF power meterPEP, average, & pulse powerPower measurement techniquesIn-line power meterAbsorption-power meters & sensorsIn many areas of RF development, design, test, service repair and field service, RF and microwave power meters or wattmeters are needed.
Auroral propagation tutorial includes:Auroral propagationThe sight of an aurora in the sky at night can be awe inspiring, taking the form of beautifully coloured glows gracefully changing sky. The colours are usually greens and reds, although on occasions bluish tints can be seen. To many people an aurora is a beautiful sight to see but it is also an indication of activity in the skies that can also result in some dramatic changes to radio propagation.
Ciircuits, Diagrams & Symbols Includes:Circuit symbols overviewResistorsCapacitorsInductors, coils, chokes & transformersDiodesBipolar transistorsField effect transistorsWires, switches & connectorsAnalogue & functional circuit blocksLogicDistinct symbols have been used to depict the different types of electronic components in circuits, since the very beginning of electrical and electronic science.
Radio technology and radio frequency design or RF design are key to the operation of many items like radios, mobile phones, Wi-Fi routers and many other radio based devices.Understanding the building blocks used and the techniques adopted enables RF design, maintenance and usage to be undertaken effectively.
Radio Receivers Tutorial Includes:Receiver typesTRF receiverCrystal radio setRegen receiverSuper-regenSuperheterodyne radioOver the years, many different types of radio receiver have been designed.The different types of receiver have arisen out of the needs of the day and the technology available.Early radio receivers had poor performance compared to those used today.
NFC, Near Field Communication Includes:What is NFC?NFC technologyNFC RF signalData exchange formatNFC Tags & tag typesNFC securityNFC, Near Field Communication technology has taken off in a big way. It is incorporated into may payment cards, ticketing and the like to enable swift and very easy transactions to be made.
Automatic Test Equipment, ATE Includes:ATE basicsAutomated optical inspection, AOIAutomated X-ray inspection, AXIIn-Circuit test, ICTFunctional test, FATEDeveloping test strategyATE automatic test equipment is a vital part of the electronics test scene today. Automatic test equipment enables printed circuit board test, and equipment test to be undertaken very swiftly - far faster than if it were done manually.
TV antennas buying guides include:Buying a TV antennaBuying TV antenna amplifier / boosterSelecting the right TV antenna for your particular television and location requires a number of things to be considered.The type of antenna - is it to be used for satellite or terrestrial, along with decisions about an internal or external antenna, antenna gain, format and many other things.
Bluetooth Tutorial / Summary Includes:Bluetooth technology basicsRadio interfaceFile transferBluetooth profilesPairing & networkingSecurityBluetooth technology is well established and is able to provide wireless connectivity for an ever increasing number of items from Bluetooth wireless headphones to mobile phone and laptop short range connectivity and wireless computer mice to many other devices requiring short range wireless connectivity.
Code Division Multiple Access, CDMA was an innovative use of direct sequence spread spectrum technology used to provide a multiple access scheme for mobile telecommunications and other wireless systems.CDMA used the property of DSSS that unless the transmitter and receiver used the same spreading code for both ends of the process, the signal could not be decoded and in this way it was able to provide a means of enabling a variety of different users to use the same channel to access a base station without mutual interference.
QSO / contact formats includes:HF QSO / contact formatMorse code QSOAmateur radio contacts can take a variety of forms on the HF ham radio bands. As a result, when starting out on the HF bands it helps to have an idea of the format for a contact and the procedures involved. In this way it is possible to converse with other ham radio operators in the most efficient and effect manner.
Smart Speakers Includes:What is a smart speakerSmart speakers have become very popular and there is a variety of smart speakers on the market from many different manufacturers.These smart speakers enable us to do a variety of different things from controlling wireless enabled lights to ordering various products and takeaways online as well as providing information like the weather forecast, time, date and many more things.
The transistor enables many circuits to be designed with a variety of different functions. From amplifiers to buffers and filters to oscillators, current sources, long tailed pairs and many, many, more.Whatever the circuit, the basic biasing conditions follow the same basic rules, but the topology of the circuit enables transistor to be used in a variety of ways to provide many different circuit functions.
Diode Tutorial Includes:Diode typesDiode specs & ratingsPN junction diodeLEDPIN diodeSchottky barrier diodeVaractor / varicapZener diodeThe semiconductor diode is a widely used electronics component found in many electronic circuit designs today.Although there are many different types of diode which use the same basic structure of an area of p-type material meeting an area of n-type material, the different types are optimised to provide different characteristics which can be used in a variety of ways in many electronic circuit designs.
Loudspeaker Tutorial Includes:What is a loudspeaker: basicsMoving coil loudspeakerLoudspeaker enclosuresLoudspeaker repairsSpeaker wire / cableSpeaker placementThe argument about the quality of speaker cable or speaker wire has been discussed by audiophiles for many years and the topic is set to continue for many years to come.
Electrical Power Includes:What is powerAn important aspect of any electrical or electronic circuit is the power associated with it. It is found that when a current flows through a resistor, electrical energy is converted into heat. This fact is used by electrical heaters which consist of a resistor through which current flows.